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\(a.\frac{8}{7}+\frac{4}{7}\times\left(-\frac{6}{11}\right)-\frac{4}{7}\times\frac{5}{11}\)
\(=\frac{8}{7}+\frac{4}{7}\left(-\frac{6}{11}-\frac{5}{11}\right)\)
\(=\frac{8}{7}+\frac{4}{7}.\left(-1\right)\)
\(=\frac{8}{7}-\frac{4}{7}\)
\(=\frac{4}{7}\)
a)27^6:9^3=(3^3)^6:(3^2)^3=3^18:3^6=3^12
b)4^20:2^15=(2^2)^20:2^15=2^40:2^15=2^25
a) 27^6 : 9^3
= ( 3^3)^6 : ( 3^2)^3
= 3^18 : 3^6
= 3^12
b) 4^20 : 2^15
= ( 2^2)^20 : 2^15
= 2^40 : 2^15
= 2^25
d) 64^4 x 16^5 : 4^20
= (4^3)^4 x (4^2)^5 : 4^20
= 4^12 x 4^10 : 4^20
= 4^22 : 4^20
= 4^2
1: \(\dfrac{-7}{4}\cdot\dfrac{2}{9}=\dfrac{-14}{36}=\dfrac{-7}{18}\)
2: \(=\dfrac{12}{13}\cdot\dfrac{26}{5}=\dfrac{24}{5}\)
3: \(=\dfrac{20}{11}\cdot\dfrac{55}{21}=\dfrac{100}{21}\)
4: \(=\dfrac{-40}{240}=\dfrac{-1}{6}\)
các bn lm đến đâu cx dc miễn là lm hộ mk cái ạ, ai đang lm vào nhắn tin vs mk để mk bít nha
a; \(-\dfrac{8}{3}+\dfrac{7}{5}-\dfrac{71}{15}< x< -\dfrac{13}{7}+\dfrac{19}{14}-\dfrac{7}{2}\)
-\(\dfrac{19}{15}\) - \(\dfrac{71}{15}\) < \(x\) < -\(\dfrac{1}{2}\) - \(\dfrac{7}{2}\)
-6 < \(x\) < -4
vì \(x\) \(\in\) Z nên \(x\) = -5
(x/-5+2/3);11/5-1,4.15/49=|-5|/21
(x/-5+2/3);11/5-1,4.15/49=5/21
(x/-5+2/3);11/5-21/49=5/21
(x/-5+2/3);11/5=5/21+21/49
(x/-5+2/3);11/5=35/147+63/147
(x/-5+2/3);11/5=35+63/147
(x/-5+2/3);11/5=98/147
x/-5+2/3=98/147.11/5
x/-5+2/3=98.11/147.5
x/-5+2/3=1078/735
x/-5+2/3=154/105
x/-5=154/105-2/3
x/-5=154/105-70/105
x/-5=154-70/105
x/-5=84/105
x/-5=-4/-5
suy ra x=-4
\(5^{20}:\left(5^{15}.15+5^{15}.10\right)\)
\(=5^{20}:(5^{16}+5^{15}.5.2)\)
\(=5^{20}:\left(5^{16}+5^{16}.2\right)\)
\(=5^{20}:[5^{16}.(1+2)]\)
\(=5^{20}:5^{16}.3\)
\(=5^4.3\)
\(=625.3\)
\(=1875\)